|Election|Party name|Total votes|Share of votes|Seats|Share of seats|Party Leader(s)|Notes|
|---|---|---|---|---|---|---|---|
|1961|Progressive Party|69,045|8.6%|1|0.6%|Jan Steytler|National Party (NP) victory|
|1966|Progressive Party|39,717|3.1%|1|0.6%|Jan Steytler|NP victory|
|1970|Progressive Party|51,760|3.5%|1|0.6%|Jan Steytler|NP victory|
|1974|Progressive Party|58,768|5.3%|7|4.1%|Colin Eglin|NP victory|
|1977|Progressive Federal Party|177,705|16.7%|17|10.3%|Colin Eglin|NP victory; PFP gains official opposition status from United Party|
|1981|Progressive Federal Party|265,297|19.4%|27|15.2%|Frederik van Zyl Slabbert|NP victory; PFP remains official opposition|
|1987|Progressive Federal Party|288,579|13.9%|20|11.2%|Colin Eglin|NP victory; PFP loses official opposition status to Conservative Party|
|1989|Democratic Party|431,444|20.0%|34|19.1%|Zach de Beer, Denis Worrall and Wynand Malan|NP victory|

Question: how many consecutive times is the progressive party listed?
Answer: 4